From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance graph showing B.HP, B.M.E.P., thermal efficiency, and consumption against R.P.M., including a valve timing diagram.
| Identifier | ExFiles\Box 180\M4\M4.2\ img017 | |
| Date | 25th February 1923 guessed | |
| VALVE TIMING. E.C. I.O 5° I.C. 45° E.O 40° B.H.P. B.M.E.P. BRAKE THERMAL EFFCY. PTS/BHP/HR. R.P.M. B.M.E.P. lbs/sq" THERMAL EFFCY % CONSUMPTION PTS/HP/HR. Left Y-Axis (B.H.P.): 20, 40, 60, 80, 100, 120 X-Axis (R.P.M.): 500, 1000, 1500, 2000, 2500 Right Top Y-Axis (B.M.E.P.): 80, 90, 100, 110, 120 Right Middle Y-Axis (THERMAL EFFCY %): 20, 25, 30 Right Bottom Y-Axis (CONSUMPTION): .50, .60, .70 | ||